新增http、mqtt运行库，实现mqtt功能, 新增spdlog

src/app/AppData.h

@@ -7,6 +7,7 @@
 #include <unordered_map>
 #include "common/Fields.h"
 #include "app/Config.h"
+#include "common/Spdlogger.h"
 
 class Station;
 class Device;
@@ -66,6 +67,7 @@ public:
     User getUser(std::string token);
 
     std::shared_ptr<Station> getStation(int stationId);
+    int getStationCount();
 
     std::shared_ptr<Station> getStationByName(std::string name);